# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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Re: Calculating the time when GHA is equals zero?
From: Tony Oz
Date: 2020 Mar 12, 11:02 -0700

Dear Jeremy,

You say:

1900 GHA = 349°15.4' Difference of 10°44.6'

Where do these figures come from? In Steve's question GHAMoon was given 349.29° which equals to 349°17.4'. The remaining angle to 360° is 10°42.6', not 10°44.6'. The total change of the GHAMoon between 19UT and 20UT is 10°42.6' + 3.77° = 10°42.6' + 3°46.2' = 14°28.8'.

All in all, my answer is:

(10°42.4' / 14°28.8')° = 0h44m22.8s.

So, the UT when GHAMoon equals 0° is 19h44m23s.

Regards,
Tony
60°N 30°E

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